Mathematics, 06.08.2021 05:00 krrrr

18. Brad is designing an A-frame house and needs to include angular dimensions in the diagram below. Angles 1, 2 and 3 add up to 180 °. The sum of angles 3 and 4 is 180 °. Angle 1 is 50 ° and angle 2 is 20 °. Write an equation that you can use to determine the measure of an angle 4.

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